Process for facing stereotype-metal.



* UNITED s'rATEs PATENT OFFICE.

WILLIAM R. FISHER, OF SAN FRANCISCO, CALIFORNIA, ASSIGNOR OF ONE-THIRD TO JOSEPH F. MORAN, OF SAN FRANCISCO, CALIFORNIA.

PROCESS FOR FACING STEREOTYPE-METAL.

of California, have invented new and useful Improvements in Processes for Facing Stereotype-Metal, of which the following is- I a specification.

My invention relates tothe process for facing stereotype metal such as used for printing and other purposes, with a metal which will increase the life and wear of the V plate, which invention will be more fully explained in the following specification.

The usual stereotype plates whlch are employed for printing and like purposes are very short lived, and soon become worn and crushed so that the matter represented upon the plate becomes blurred, and the plates must be renewed. For the purpose of producing more lasting plates, electro-types have been employed. These are formed by means of wax molds impressed by the type or matter to be printed, the molds being afterward coated with black lead and an electro deposition of the facing metal produced, after which it is filled up by melted metal to give a suliicient supporting surface. In my in vention I apply a copper, or other hard enduring surface directly to the face of the stereotype metal, and by my process I am enabled to so unite the facing metal to the stereotype plate as to make it practically homogeneous, and prevent the facing metal from being peeled off, and the block rendered useless.

f In carrying out my process, the stereo block is cast of type metal in the usual papier Specification of Letters Patent.

Application filed December 14, 1908.

the face of the stereo block. 'then ready for a facing, and 1s placed 111 a Patented June 15, 1909.

Serial No. 467,4:73.

macho, or equivalent mold. The block is then cleaned by the use of a solution of caustic potash, then thoroughly washed in clean water, after which it is placed in a bath of potassium cyanid, and scraped with pumice powder, and again well washed with clean water. The block is then placed in a weak solution of cyanid of platintnnwhere it remains for a few minutes, and a thin coating of the metal will be deposited upon The block is solution of copper or other material, which is subject to electro deposition, and is sufficiently hard for the desired purpose.

The usual method of electro deposition may be employed, the electrical current being a light one, and when a sufficient facing has been made, the plate is practically in destructible by use.

Having thus described my invention, what I claim and desire to secure by Letters Patent is The process of facii'igstereotype and like. 

